33. healing during The Pursuer
Even though your opponent has a long reach and can easily close a distance, the boss has a slow rotation. Knowing this, try to dodge diagonally and into the attacks to get to the rear. This bought me enough time to heal with an Estus flask. You can also put a ballista between the both of you to buy some time.
Yo, #10. (Pursuer Tip), I haven't seen it much but there is a ranged attack, so watch out for that.
Edit: Or just keep your distance. You want to keep the largest possible gap between both of you. Attacks are fairly easy to dodge and you can just wait for a long attack animation (like the poking blue/cursed sword attack)